Abstract
The oscillations of the stopping power as a function of the projectile ion nuclear charge Z t are studied in detail for the case of channeled ions at low velocities. A realistic density profile for the channel is used together with an electron gas model to calculate the stopping power within a local density approximation. Nonlinear calculations using density functional theory allow us to obtain the exact transport cross section to all orders in Z 1, using the phase shifts at the Fermi level for scattering of the valence electrons, that determines the low velocity stopping power. Comparison with some experiments is carried out.
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